Keystones — Capstone
Five GCSE retrieval questions · 22 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√112
Answer: 16√7 -
2. Algebra Completing the square
Complete the square: x² - 3x + 7
Answer: (x - 3⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 24cm, angle = 64°. Give your answer to 2 decimal places
Answer: 129.43cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 56:40:45 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 98, 65, 98, 50, 10, 59, 21, 68. Give your answer to 2 decimal places
Answer: Mean = 58.67, Median = 59, Range = 88